Product Description

Galvanic Zinc Anode Marine Cathodic Protection

Xi'an Taijin's sacrificial Zinc Anodes are applied in Low Resistivity Soils below 1000Ω-cm and in Sea Water or produced Brines.. Zinc Anodes are widely used in bulkheads, piers and pilings, heat exchanger and condenser, pipelines, vessels and tankers. etc.

The performance of Zinc Anodes is affected by the chemical composition of the alloy, we have different alloy series to meet customer's request. Special shape, size and chemical composition anodes can be manufactured according your request.

A galvanic anode is the main component of a galvanic cathodic protection (CP) system used to protect buried or submerged metal structures from corrosion.

They are made from a metal alloy with a more "active" voltage (more negative reduction potential / more positive electrochemical potential) than the metal of the structure. The difference in potential between the two metals means that the galvanic anode corrodes, so that the anode material is consumed in preference to the structure.

The loss (or sacrifice) of the anode material gives rise to the alternative name of sacrificial anode.

Zinc Alloys Chemical Composition:

Elements

ASTM B418 TYPE I

MIL A -18001K

ASTM B418 TYPE II

Aluminum

0.01- 0.50

0.005 max

Cadmium

0.025-0.07

0.003 max

Lead

0.006 max

0.003 max

Copper

0.005 max

Iron

0.005 max

0.0014 max

Others(each)

0.02 max

Total others

0.05max

Zinc

Remainder

Remainder

Phsical Characteristics:

Term

Specification

Tensile strength M pa

115±10

Elongation %

45±5

melting point

419

Density g/m3

7.14

The Electrochemical Properties

Open Circuit Potential/V

Operating Potential/V

Current Capacity/ (Ah/kg)

Current Efficiency/ %

Romsumption Rate/ kg. (A. a)-1

Dissolving Pattern

-1.18~-1.10

-1.12~-1.05

≥ 2400

≥ 85

≤ 3.65

Dissolves uniformly

Features:

Long lasting shine

Startling design

Rust resistance

High purity

Applications:

• Hulls of ships, barges, boats and tugs

• Ballast tanks of tankers, ore carriers and freighters

• Bulkheads

• Piers and Pilings

• Pipelines

• Heat Exchangers

Cost effectiveness

As the anode materials used are generally more costly than iron, using this method to protect ferrous metal structures may not appear to be particularly cost effective. However, consideration should also be given to the costs incurred by removing a ship from the water, for example, to repair a corroded hull or to replace a steel pipeline or tank because their structural integrity has been compromised by corrosion.

However, there is a limit to the cost effectiveness of a galvanic system. On larger structures, or long pipelines, so many anodes may be needed that it would be more cost-effective to install impressed current cathodic protection.